Induced nuclear reactions: processes – systems – and elements – Fuel component structure – Plural fuel segments or elements
Patent
1993-11-29
1995-06-06
Walsh, Donald P.
Induced nuclear reactions: processes, systems, and elements
Fuel component structure
Plural fuel segments or elements
376458, 376419, 376444, G21C 332
Patent
active
054229227
ABSTRACT:
A fuel assembly and a reactor core using same which are able to increase size of the fuel assembly with ensuring thermal margin and reactor shut down margin.
A distance between centers of adjacent fuel assemblies is about 23 cm, which is enlarged about 1.5 times of conventional fuel assemblies. A thickness of water gap region is about 16 cm, which is relatively thinner than that of prior art. While, H/U ratio is about 5 as same as that of the prior art, and decreasing amount of non-boiling water in the water gap region is arranged in a channel box as water rods. Consequently, a ratio of transversal cross section area of the water rods to transversal cross section area of the fuel rods becomes about 0.6, and local power peaking factor can be decreased and thermal margin can be increased. Further, the transversal cross section area of the water rod is selected to be 15 cm.sup.2 so as to ensure the reactor shut down margin by reducing excess reactivity.
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patent: 4701296 (1987-10-01), Millot et al.
patent: 4789520 (1988-12-01), Morimoto et al.
patent: 5023047 (1991-06-01), Nishida et al.
patent: 5149495 (1992-09-01), Elkins
patent: 5202085 (1993-04-01), Aoyama et al.
Aoyama Motoo
Ishibashi Yoko
Koyama Junichi
Masumi Ryoji
Mochida Takaaki
Chelliah Meena
Hitachi , Ltd.
Walsh Donald P.
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